Supplemental Financial Information Supplemental Financial Information - Property, Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Property, Plant and Equipment, Gross	$ 918	$ 802
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(577)	(515)
Property, plant and equipment, net	341	287
Land and Land Improvements [Member]
Class of Stock [Line Items]
Property, Plant and Equipment, Gross	7	6
Building and Building Improvements [Member]
Class of Stock [Line Items]
Property, Plant and Equipment, Gross	278	198
Machinery and other equipment [Member]
Class of Stock [Line Items]
Property, Plant and Equipment, Gross	$ 633	$ 598